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Topic 3 - The Atomic Structure

9. Continues

12. The atom of chlorine – 37 has
1) 17 protons and a mass number of 37 3) 37 protons and a mass number of 17

2) 17 protons and a mass number of 18 4) 37 protons and a mass number of 18

13. The nucleus of 127 I contains
53
1) 53 neutrons and 127 protons 3) 53 protons and 74 electrons
2) 53 protons and 127 neutrons 4) 53 protons and 74 neutrons

14. The nucleus of which atom contains 48 neutrons?

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85
1) S 2) Ti 3) Rb 4) 112 Cd
32
48
16 21 37 48
15. Which atom contains only 12 nucleons in its nucleus?
1) 12 C 2) Mg 3) Be 4) Na
8
23
24
6 12 4 11
16. An isotope of element krypton has 46 neutrons and 36 protons. Which symbol correctly identifies
this isotope?
82
36
82
3)
Kr

4) Kr
1) 46 Kr 2) Kr 36 46
36
46
17. Which nuclide contains exactly 15 protons?
1) Sulfur – 32 2) Phosphorous – 32 3) Oxygen – 15 4) Nitrogen – 14

18. Which nuclide contains 15 neutrons?
1) Phosphorous – 15 2) Nickel – 28 3) Silicon – 29 4) Oxygen – 15

10. Isotope symbols: Comparing number of particles in isotope symbols

40
1. Compare to the atom of Ca, the atom of Ar has
38
20 18
1) Greater nuclear charge 3) The same number of nuclear charge
2) Greater number of neutrons 4) The same number of neutrons
2. Compare to an atom of C, an atom of C has
14
12
1) More protons 3) Fewer protons
2) More neutrons 4) Fewer neutrons

3. Compare to a neutral atom of Potassium - 42 , a neutral atom of Calcium – 40 contains fewer
3) Neutrons

1) Protons

2) Electrons 4) Nuclear charge

4. An atom of K- 37 and an atom of K – 42 differ in their total number of
1) Electrons 3) Neutrons
2) Protons 4) Positron

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